The Chalktrail is an inexpensive bike add-on that allows artsy boys and girls to draw pretty patterns while they ride. It also doubles (perhaps unintentionally) as a low-tech GPS device to keep track of your child's. every. move.

Chalktrail inventor Scott Baumann, of Bellingham, Washington, says he got the idea for Chalktrail (a runaway success of a Kickstarter project, if you must know) while watching his children ride bikes and...play with chalk.